Automotive electric/electronic package

Abstract

In an automotive electric / electronic package comprising an electronic component, a case for receiving the electronic component therein, and a lid covering an open top of the case, the case and the lid are joined together with a fluorochemical adhesive capable of chemically and / or physically adsorbing a corrosive gas. The package has highly reliable corrosion resistance in that the electronic component is protected from corrosion by corrosive acidic or basic gases such as sulfur compound and nitrogen oxide gases.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2007-253828 filed in Japan on Sep. 28, 2007, the entire contents of which are hereby incorporated by reference.TECHNICAL FIELD[0002]This invention relates to automotive electric / electronic packages. Typical automotive electric / electronic packages are sensors installed in the engine compartment and comprising sensing elements for detecting various physical quantities, an electronic circuit for controlling the sensing elements, and output elements for delivering electrical signals corresponding to the physical quantities, and control units comprising a microprocessor for controlling various states in the vehicle in response to the electrical signals from the sensors.BACKGROUND ART[0003]In the prior art, automotive electric / electronic packages are typically used in the encapsulated structure and implemented as physical detectors and controllers ...

AI Technical Summary

Benefits of technology

[0007]An object of the invention is to provide an automotive electric / electronic package having an electronic component received therein, which package is reliable in corrosion resistance. That is, the package is adapted to protect the electronic component from corrosion by corrosive acidic or basic gases such as sulfur compound and nitrogen oxide gases.

[0008]The inventor has found that when a fluorochemical adhesive or encapsulant capable of chemically and / or physically adsorbing a corrosive gas is used as the adhesive or encapsulant in an automotive electric / electronic package, the resulting electric / electronic package is protected with the fluorochemical adhesive or encapsulant having solvent resistance, chemical resistance and minimal permeability of acidic gases or sulfur-containing gases. This protects any electronic component received in the package from corrosion by corrosive acidic or basic gases such as sulfur compound and nitrogen oxide gases. Then the electric / electronic package to be mounted on vehicles remains reliable with respect to corrosion resistance.

[0024]In the automotive electric / electronic package of the invention, the fluorochemical adhesive or encapsulant protects any electronic component, typically a hybrid IC board, received in the package from corrosion by corrosive acidic or basic gases such as sulfur compound and nitrogen oxide gases. The electric / electronic package remains reliable with respect to corrosion resistance.

Problems solved by technology

This silicone resin composition is effective for adsorbing corrosive gases, but can be swollen or degraded by gasoline, engine oil or the like to which it is often exposed when mounted on vehicles.

The composition is thus unsuited for use in the corrosive gas atmosphere.

They are more effective than the silicone resins in preventing or retarding corrosion by acidic gases and sulfur-containing gases, but still cannot tolerate such exposure over a long term.

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